Economizing apparatus for regulating draft



A ril 17, 1934. P. c. LEYS ECONOMIZING APPARATUS FOR REGULATING DRAUGHT Filed Oct. 12, 1951 2 Sheets-Sheet l P @i/MWH April 17, 1934. P. c, s

ECONOMIZING' APPARATUS FOR REGULATING DRAUGHT 2 Sheets-Sheet 2 Filed Oct. 12, 1951 Patented Apr. 17, 1934 STATES ECONOMIZING APPARATUS FOR REGULATING DRAFT Pierre 'Clestin Leys, Brussels, Belgium Application October 12,

1931, Serial No. 568,455

In Belgium October 22, 1930 Claims.

The present invention relates to economizing .devices actuated by the draft of chimneys and in which the draft is regulated by the introduction of external air to maintain it within predeter- 5 mined limits.

This invention has more particularly for its object the construction of an apparatus having considerable efiiciency, and which is simple to construct, and strong and readily regulated,

whilst the upkeep is almost negligible, thus complying with practical needs more eiiiciently than .any hith rto constructed.

The apparatus comprises a pair of double oscillating dampers mounted on a common axis and dividing the internal space of a surrounding casing into compartments which communicate, in pairs, one with the atmosphere and the other with the chimney or a smoke flue of which the draft is to be regulated, the said dampers comprising additional movable and adjustable masses,

whilst one of the pairs of compartments comprises perforated screens of which the openings and outlets comply with a predetermined formula, these compartments being subjected to a partial vacuum.

In addition to this main device, the invention includes other devices, more particularly of a constructional nature, and these various features are illustrated, by way of example, in the annexed drawings, in which:

Fig. 1 is a perspective view, certain parts of the dampers and their suspension elements being removed.

Fig. 2 is a part sectional view showing the construction of the casing of the apparatus.

Fig. 3 is an end,.view of this casing.

Figs. 4 and 5 are detail views, and

Fig. 6 shows a modified form of construction.

As shown in the drawings, the apparatus comprises a pair of double dampers 1 and 2, the damper 1 being arranged horizontally, whilst the damper 2 is arranged substantially vertically.

The damper l rests by means of two knife edges 3 in grooves 4 provided with stops preventing the longitudinal displacement of the edges 3 and formed in supports 5 secured to the ends '7 of the casing, the knives 3 being secured to angle irons 8 fixed to the damper 1, whilst balancing masses may be arranged on the other surface of the damper or preferably replaced by a balance bar 9 which ensures longitudinal rigidity of the damper.

Transversely and near the center is arranged a rod 10 on which an additional mass 11 is adapted to be displaced, this mass ensuring the regulation of the oscillations of the damper.

The rod 10 is preferably screw-threaded and the additional mass 11 is in the form of a cylinder held in place by means of a nut 12.

The damper 2 comprises two elements, each having a straight portion 32 and a curved portion 33, the latter bearing against and being secured to two rings 13 which carry the knife edges 14 which engage in the grooves 4 of the supports 5.

At the end of the curved portions 33 there are provided flanges 34 which serve as stop members.

One of the straight portions 32 is preferably slightly diverted from the vertical plane and, as in the case of the damper 1, there is provided a rod 15 which carries an additional balance mass 16 which is preferably in the form of a cylinder screwed to the rod 15 and locked in position by a nut 17.

The assembly of dampers and their supporting members is enclosed in a cylindrical casing 18, of 'which'the upper part 19 is preferably removable and has in the cylindrical portion four shoulders or internal flanges 20, which form abutments for the outer edges of the dampers, whilst laterally there are further shoulders or internal flanges 21 which serve as abutments for the lateral edges of the dampers.

Each of these shoulders is preferably provided with a covering 36, such as a ribbon of asbestos, to ensure fluid tightness.

The casing 18 is provided with a lateral exten-. sion arranged as shown in Fig. 4 for connection to a vertical chimney, or as shown in Fig. 6 for the support of a horizontal smoke flue.

As can be seen in Fig. 2, the dampers mounted in the casing 18 divide the inner space of this casing into four compartments 22, 23, 24 and 25, of which one pair 22, 24 communicates with the surrounding space by means of openings 26, as shown in Fig. 2, these openings being preferably provided with a metal lattice member, whilst the compartments of the other pair 23, 25, communicate by means of openings of sector shape 2'7, 28, Fig. 3, with a space subjected to a partial vacuum.

As shown, the openings 27 and 28 are provided with perforated members 29, of which the perforations 30 have increasing cross section in proportion as they approach the central line M M of the openings.

Finally, stops 31 are provided and are located substantially half way between the dampers and the compartments 23, 25, and the knife edges 3 and 14 are arranged in such manner that their plane of bisection is substantially vertical in cases where the inclination of the dampers is about 30.

An apparatus constructed as described above, and assuming that the various elements are efficiently assembled, functions in the following manner:

In the state of rest, that is to say if there is no vacuum or if the normal pressure exists in the chimney or flue, the dampers balanced for this pressure remain in contact with their respective stops, and no back flow of external air can exist in the compartments 23 and 25 and the chimney or flue.

If, on the other hand, the said fall in pressure exceeds the normal, the dampers subjected onthe one hand to this fall in pressure and on the other hand to the atmospheric pressure, are more or less displaced and oscillate so that a certain number of the perforations 30 are uncovered, with the result that there is a flow of external air into the chimney or the flue.

This :fiow of air acting tobalance the fall .in -pressure,'the dampers close but open again if the fallin pressure-subsequently exceeds the normal one, and so on the successive openings and closings of the air passages, which may eventually stant the draft-effect.

Itis obvious that the combination of the-dampers of considerable surface, the perforations 30 of varying cross section, and the balancing device'described enables the apparatus to have any degree of sensitiveness, the openings 2'7 and 28 being'if necessary of a form other than that of a sector.

Also other modifications of a constructional nature could be introduced into the apparatus described without departing from the spirit of the invention.

I claim:

1. A draft economizing regulatorfor a chimney or smoke flue subjected to a-partial vacuum and comprising-a casing, a pair of double oscillating dampers mounted on a common axis and dividing the interior space of the casing into four circuend to the inlet passage and the other pair of compartments is connected at the opposite end to the outlet passage.

3. An economizer according to claim 1, in which one of the double dampers is arranged substantially in a horizontal plane, and the elements of the other double damper are located substantially in a vertical plane, knife edges for directly supporting the .horlzontaldamper, knife edges for the elements of the vertical damper,

rings carrying and surrounding said last named knife edges and to which said elements are connected, and supports for the last named knife 5 edges whereby independent oscillation of the dampersis obtained.

4. An economizer according to claim 1 inwhich one of the double dampers is arranged substantiallyin a horizontal plane,-and theelements of Which-the other doubledamper are located substantially in a vertical plane, supports for the dampers in the casing, anda removable upper part for said casing.

=-5. An economizer according to claim 1 in which "1 one of the double dampers is arranged substantially in a horizontal plane andthe elements of the other doubledamper are located substantially-in a vertical plane, knife edges for supporting the horizontal damper, knife edges for supportingthe vertical damper and said knife edges constructed so that their planes of bisection occupy a position which is substantially vertical .whentheinclination of the dampers is about 30.

PIERRE CELESTIN LEYs. 

